What Are the Process Conditions for Setting Blow Moulds?

Blow mould process adjustment aims to ensure that the product thickness is as uniform as possible while meeting the minimum wall thickness requirements, and that the weight of the product is as small as possible (reducing material consumption). The reasonable method for setting the process parameters of the blow mould parts is to combine experience with numerical analysis technology.

Process conditions of blow mould

• Use the established computer model to simulate the state of the blow mould, blanking billet, and clamping plate.

• Input the parameters that affect the distribution of wall thickness of the billet in each stage.
  

• Analyze the simulated results, and determine which parts of the wall thickness do not meet the requirements, and which parts have excessive wall thickness.
  

• Adjust the input parameters based on manual experience, repeat the process from the first step to the third step, and ensure that the wall thickness of each part of the product is minimized while meeting the minimum wall thickness requirement.
  

• Analyze and compare the results of multiple process schemes, and finally determine the optimized process parameters. Stretch blow molding, also known as biaxial orientation blow molding, is a method of forming packaging containers by axially stretching the billet in a high-elastic state of polymer and blowing (stretching) the billet radially using compressed air.
  

Development trend of blow mould molding

The raw materials for blow moulds will become more diverse and have better processing properties so as to meet the functional and performance (medical, food packaging) requirements of blow moulded products. For example, PEN materials not only have high strength, good heat resistance, strong gas barrier properties, transparency, and UV resistance, but also can be used to blow various plastic bottles. They have high filling temperature, excellent gas barrier properties for carbon dioxide and oxygen, and are resistant to chemical drugs.

Product packaging containers and industrial products will see significant growth, and injection blow molding and multi-layer blow molding will develop rapidly. The blow molding machinery and equipment will become more precise and efficient, and the automation of auxiliary production (operation) equipment will increase. "Precision and high efficiency" not only refers to the high speed and high pressure of mechanical equipment during production and molding, but also requires that the produced products have high stability in terms of the fluctuation of external dimensions and weight, that is, the high geometric precision of the size and shape of the various parts of the produced products, small deformation and shrinkage, and high overall appearance and quality, production efficiency and other indicators. Auxiliary operations include trimming, cutting, weighing, drilling, leak detection, etc., and the automation of the process is one of the development trends. The research on blow mould modeling that simulates the blow molding mechanism will become more in-depth, and the reasonable construction of mathematical models for blow molding simulation and fast and accurate numerical algorithms are the keys to simulation. Blow molding simulation will play an increasingly important role in predicting and controlling product quality.